how have the gobi desert made it difficult for other cultures to gain access to china in ancient times

Place the point of the compass on point b and draw an arc that intersects  be¯¯¯¯¯  , using    ab    as the width for the opening of the compass.  hope it

Answer(a); // soil salinization and waterlogging;

The peak above is part of the  sierra madre occidentals ,  a chain of volcanic mountains that runs through the middle of central america.